Earlier quoted context omitted.
And even those problems are very far down the line if the business logic results in the expected revenue.
Finding talented developers that want to work on your codebase is a factor in your example. More and more developers are realising they don't want to work with PHP. How much revenue will you get without developers? Go ahead, keep using PHP for your existing multi million dollar product. But using PHP for new projects is not wise.
PHP shops won't attract from the same pool of talent. It's not that there aren't good PHP developers, it's that there are so many brilliant engineers that are never going to consider such work.
Languages matter.